PVC S72, designated as Grade S-7242, is a high K-value polyvinyl chloride resin developed by Arvand Petrochemical Company. It is tailored specifically for high-performance applications that demand exceptional mechanical strength and durability.
 
Product Description
K-Value: 72±1, indicating a high molecular weight which contributes to the resin's excellent mechanical properties and rigidity.
Viscosity Number: 127-137 ml/g (DIN ISO 1628-2), highlighting its higher resistance to flow under applied stress, suitable for demanding applications where higher viscosity is beneficial.
Bulk Density: 430-490 g/l (DIN ISO 60), which affects the handling and processing characteristics of the resin during manufacturing.
 
Properties and Specifications
Sieve Analysis:
>63 µm (%): 95-100 (DIN ISO 4610), ensuring almost all particles are above 63 µm, indicative of coarse granulation that benefits uniform melting and processing.
>250 µm (%): 0-1 (DIN ISO 4610), virtually eliminating larger particles, which enhances the smoothness of the final product.
Porosity (Plasticizer Absorption): 30-35 (DIN ISO 4608), this high level of porosity indicates the resin's ability to absorb significant amounts of plasticizer, increasing its flexibility and workability.
Volatile Matter (%): <0.3 (ISO R-1269), confirming low levels of impurities and volatiles which enhances the stability of the resin during thermal processing.
Flowability (S/150 g): ≤35 (DIN ISO 6186), with a maximum flowability limit through a 10 mm nozzle, illustrating the resin's good processing characteristics under high loads.
Residual VCM (ppm): ≤1 (DIN ISO 53743-6401), ensuring that the amount of residual vinyl chloride monomer is kept to a minimal, enhancing the safety profile of the resin.
Dark Resin Particles: ≤10, an indicator of the resin's purity and quality in terms of visual defects within the resin matrix.
Fish Eyes: ≤2 per 25 cm², further asserting the resin's high quality by showcasing minimal imperfections in clarity.
 
Applications
PVC S72 - Grade S-7242 is primarily used for:
Rigid and Semi-Rigid Profiles and Sheets: Ideal for applications requiring materials that offer both strength and a slight degree of flexibility.
Rigid Film and Bottles: Suitable for products that demand high impact strength and clarity.
Injection Molded Parts: Used in the production of intricate and durable components.
 
Summary
PVC S72 - Grade S-7242 stands out due to its high K-value, excellent viscosity properties, and robust mechanical characteristics, making it suitable for a variety of high-demand applications. Its properties ensure that it can be used effectively in producing components that require superior strength, durability, and resistance to deformation. This grade is particularly valuable in sectors where high-quality rigid and semi-rigid PVC products are crucial, such as in building materials, automotive parts, and durable consumer goods. The stringent control of particle size, porosity, and other quality measures further confirms its suitability for producing high-end PVC products.